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Posted by **Kyle** on Monday, April 9, 2012 at 9:29am.

(3+9i)-(12-5i)

8+6i/7-5i

- 1 out of 2 -
**Sofia**, Monday, April 9, 2012 at 9:47amRewrite as:

3+9i-12+5i

Add like terms:

-9+14i is your answer.

- math -
**Reiny**, Monday, April 9, 2012 at 10:05amfor the 2nd, multiply top and bottom by 7+5i

(8+6i)/(7-5i) * (7+5i)/(7+5i)

=(56 + 40i + 42i + 30i^2)/(48 - 25i^2)

= (26 + 82i)/73 . remember i^2 = -1

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